Improvement in grain-drill teeth



J. H. LEWIS.

GRA.IN-DRILL TEETI'I.

No.183947 Patented Oct. 31, 1876.

UNITED STATES PATENT OFFICE.

JAMES H. LEWIS, OF DETROIT, MIOHIGAN.

IMPROVEMENT IN GRAlN-DRILL TEETH.

Spe'acifi cation forming paart of Letters Patent N0. 183,947, dated O0tober 31, 1876; applica.tion filed September 5, 1876.

T0 all whom z't mag; concern B0 it known thatrI, JAMES H. LEWIS, 0f Detroit, in the county of Wayne .and Statue of Michi,gan, have invented an Improved Gradm- Drill Tooth, of which the following is a specification:

'Ihe first part of my invent-ion relates t0 a device Gast in the bottom end 0f the tooth for spreading the seed as it issues from the spout and consists in a semi-eonieal apron cast upon or with the foot 0f the tooth as a rearward extension 0f its point.

The second part 0f my invention relates to an improved means 0f hanging the furrowclosiug platte a1; the rear 0f the tooth, to which I d0 not attach it rigidly, as heretofore, but bang it so that it will yield when drawn over stones 0r other solid obstructions.

Figure 1 is a. perspective view. Fig. 2 is a vertical seotion. Fig. 3 is n rear perspective view of the spreader and. lower end of the drill-tooth.

In the drawing, A represents a drill-tooth, cast with a pointed f0ot, a, to Which is secured the usual furrow-opener B. The rear end 0f the point a, iustead 0f forming one 0f the sides 0f a triangle, as heretofore, is extended t0 the rear in the form of avertically-divided cone, b, extending up ix1to the flaring mouth 0 of the t0oth, so that the seed in falling upon it will be spread out broadcast in the furrow. Sown in this manner the seed has ample room to germinate, and is less liable 130 choke in its growth, thereby yielding a better crop.

0 is a flanged covering-plate, heretofore rigidly secured to the back 0f the tooth, f0r COV- ering back the upturned soil into the furrow.

In running over stones, hard clods, lumps of sod, and other like obstructions, it was liable t0 be broken oft. T0 overcome this objection I rivet it t0 a malleable-iron strap, D, bent as shown, and forked ab the upper end, which embraces and is pivoted to a Ing, d, cast 011 the back of the tooth. T0 a lower Ing, e, is pivoted a rod, f, which passes through an eye in the strap, and between which and a nut 0n the outer end 0f said rod a spring, g, is coiled thereon, which Will only allow the coveringplate to yield 110 an obstruction oftering greater resistance than the soil 0f the furrow-trench.

I (10 not claim, broadly, the invention 0f a seed spreader placed in the lower end 0f a grain-drill tooth, f0r the same is shown in the patent 0f Mansfield 0f August 28, 1860; but

What I claim as my inventi0n isl. A grain-drill t0oth, A, having the semiconical spreader b, cast as a rearward extension 0f its point a, substantially as described.

2. The combination, with a grain-drill tooth, 0f the yielding coveriug-plate G, the hinged strap D, and the spring g 011 the back 0f such tooth, substantially as described am]. shown.

JAMES H. LEWIS.

Witnesses:

H. F. EBERTS, 0. R. HULETT. 

